Synergistic Dual ‐Atom Molecular Catalyst Derived from Low‐Temperature Pyrolyzed Heterobimetallic Macrocycle‐N4 Corrole Complex for Oxygen Reduction

The identification of metal –N4 active sites based on non-precious electrocatalysts for the cathodic oxygen reduction reaction (ORR) to reduce the cost of low-temperature fuel cells is highly challenging. Herein, the authors have newly developed a defined heterobimetallic (Co–Fe) center preserved by low-temperature pyrolys is of its pristine macrocycle-N4 corrole integrated on multi-walled carbon nanotubes for enhanced ORR performance. AbstractA heterobimetallic corrole complex, comprising oxygen reduction reaction (ORR) active non-precious metals Co and Fe with a corrole-N4 center (PhFCC), is successfully synthesized and used to prepare a dual-atom molecular catalyst (DAMC) through subsequent low-temperature pyrolysis. This low-temperature pyrolyzed electrocatalyst exhibited impressive ORR performance, with onset potentials of 0.86 and 0.94  V, and half-wave potentials of 0.75 and 0.85 V, under acidic and basic conditions, respectively. During potential cycling, this DAMC displayed half-wave potential losses of only 25 and 5 mV under acidic and alkaline conditions after 3000 cycles, respectively, demonstrating its excellent stabilit y. Single-cell Nafion-based proton exchange membrane fuel cell performance using this DAMC as the cathode catalyst showed a maximum power density of 225 mW cm−2, almost close to that of most metal –N4 macrocycle-based catalysts. The present study showed that preservation of the defined CoN4 structure along with the cocatalytic Fe–Cx...

Source: Small - October 19, 2021 Category: Nanotechnology Authors: Satyanarayana Samireddi, V. Aishwarya, Indrajit Shown, Saravanakumar Muthusamy, Sreekuttan M. Unni, Ken ‐Tsung Wong, Kuei‐Hsien Chen, Li‐Chyong Chen Tags: Research Article Source Type: research